RFR (XS): JDK-8032222: [TESTBUG] runtime/SharedArchiveFile/CdsWriteError.java fails on Mac OS with java.lang.RuntimeException

[Mikhailo Seledtsov]

Please review the following small change to the test.

     JBS: https://bugs.openjdk.java.net/browse/JDK-8032222
     Webrev: http://cr.openjdk.java.net/~mseledtsov/8032222/webrev.00/

     Testing:
         1. Local testing: ran the test - sanity check
         2. Executed the test via JPRT
             2014-03-24-163056.mseledtsov.work01